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Squid can be used as a reverse proxy to load balance several web servers instead of using a hardware load balancer. This is useful because Squid can cache a lot of the content coming from the source web servers, thereby reducing their load. However, it isn't quite obvious how to create an Apache style redirect where all hostnames other than the root domain get redirected to www.hostname.com. One way to accomplish this is using a re director program, as shown below.

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EditSteps

  1. 1
    Write a simple redirector program such as the following using Perl: 
    #!/usr/bin/env perl
$|=1;
while (<>) {
  $url = m/^([^ ]*)/;
  if ($url !~ /^http:\/\/www\.hostname\.com/) {
    $url =~ s@^http://www\.hostname\.com/(.*)@http://www.hostname.com/\1@;
    print "301:$url\n";
  } else {
    print "$url\n";
  }
}
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  2. 2
    In your squid.conf file change the redirect_program variable, it's probably commented out, and specify where your redirector_program is, ex: /usr/sbin/redirect.pl

  3. 3
    Make sure that the variable httpd_accel_uses_host_header is set to on or nothing will be redirected.
  4. 4
    Reload the squid configuration. You'll need to know the path to the squid executable. Depending on your operating system and installation, it's most likely at /usr/local/squid/sbin/squid. Execute this command on the terminal: 
    /usr/local/squid/sbin/squid -k reconfigure
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Article Info

Categories: Website Maintenance

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